Trim Sizes

{
  "asOf": "2026-10-12T01:40:26.202Z",
  "aspectRatio": 1.5,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "match": {
    "heightIn": 9,
    "heightMm": 228.6,
    "size": "6x9",
    "use": "US trade, nonfiction, novels",
    "widthIn": 6,
    "widthMm": 152.4
  },
  "nearestStandard": null,
  "notChecked": [
    "which sizes your printer actually offers (each printer supports a subset, and page-count limits differ by size)",
    "hardcover and special-format sizes",
    "…1 more"
  ],
  "reasons": [
    "Matches a size in the built-in table."
  ],
  "requestedHeightIn": 9,
  "requestedHeightMm": 228.6,
  "requestedWidthIn": 6,
  "requestedWidthMm": 152.4,
  "source": "computed locally from a built-in table of common US trade trim sizes (inches; mm = in x 25.4)",
  "summary": "6 x 9 in (152.4 x 228.6 mm) is a standard trim: US trade, nonfiction, novels.",
  "verdict": "STANDARD_SIZE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://publishing-calc.x402tookit.com/trim-sizes?size=6x9'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://publishing-calc.x402tookit.com/trim-sizes?size=6x9' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fpublishing-calc.x402tookit.com%2Ftrim-sizes
const res = await pay("https://publishing-calc.x402tookit.com/trim-sizes?size=6x9");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://publishing-calc.x402tookit.com/trim-sizes?size=6x9")
    print(res.status_code, res.text)